<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator-class='el-icon-arrow-right'>
      <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图-->
    <el-card>
      <el-alert title='注意只允许为第三级分类设置相关参数' type='warning' :closable='false' show-icon></el-alert>
      <!--选择商品分类区域-->
      <el-row class='opt'>
        <el-col>
          <span>选择商品分类: </span>
          <!--选择商品分类的级联选择框-->
          <el-cascader
            v-model='selectedCateKeys'
            :options='catelist'
            :props='cateProps'
            @change='handleChange'></el-cascader>
        </el-col>
      </el-row>
      <!--tab页签区域-->
      <el-tabs v-model='activeName' @tab-click='handleTabClick'>
        <!--动态参数面板-->
        <el-tab-pane label='动态参数' name='many'>
          <el-button type='primary' size='mini' :disabled='isBtnDisabled' @click='addDialogVisible=true'>添加参数
          </el-button>
          <!--动态参数表格-->
          <el-table :data='manyTableData' border stripe>
            <el-table-column type='expand'>
              <template slot-scope='scope'>
                <el-tag v-for='(item, i) in scope.row.attr_vals' :key='i' closable @close='handleClose(i, scope.row)'>
                  {{ item }}
                </el-tag>
                <el-input
                  class='input-new-tag'
                  v-if='scope.row.inputVisible'
                  v-model='scope.row.inputValue'
                  ref='saveTagInput'
                  size='small'
                  @keyup.enter.native='handleInputConfirm(scope.row)'
                  @blur='handleInputConfirm(scope.row)'
                >
                </el-input>
                <el-button v-else class='button-new-tag' size='small' @click='showInput(scope.row)'>+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <el-table-column type='index'></el-table-column>
            <el-table-column label='参数名称' prop='attr_name'></el-table-column>
            <el-table-column label='操作'>
              <template slot-scope='scope'>
                <el-button type='primary' icon='el-icon-edit' size='mini' @click='showEditDialog(scope.row.attr_id)'>
                  编辑
                </el-button>
                <el-button type='danger' icon='el-icon-delete' size='mini' @click='removeParams(scope.row.attr_id)'>删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!--静态属性面板-->
        <el-tab-pane label='静态属性' name='only'>
          <el-button type='primary' size='mini' :disabled='isBtnDisabled' @click='addDialogVisible=true'>静态属性
          </el-button>
          <!--静态属性表格-->
          <el-table :data='onlyTableData' border stripe>
            <el-table-column type='expand'>
              <template slot-scope='scope'>
                <el-tag v-for='(item, i) in scope.row.attr_vals' :key='i' closable @close='handleClose(i, scope.row)'>
                  {{ item }}
                </el-tag>
                <el-input
                  class='input-new-tag'
                  v-if='scope.row.inputVisible'
                  v-model='scope.row.inputValue'
                  ref='saveTagInput'
                  size='small'
                  @keyup.enter.native='handleInputConfirm(scope.row)'
                  @blur='handleInputConfirm(scope.row)'
                >
                </el-input>
                <el-button v-else class='button-new-tag' size='small' @click='showInput(scope.row)'>+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <el-table-column type='index'></el-table-column>
            <el-table-column label='属性名称' prop='attr_name'></el-table-column>
            <el-table-column label='操作'>
              <template slot-scope='scope'>
                <el-button type='primary' icon='el-icon-edit' size='mini' @click='showEditDialog(scope.row.attr_id)'>
                  编辑
                </el-button>
                <el-button type='danger' icon='el-icon-delete' size='mini' @click='removeParams(scope.row.attr_id)'>删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--添加参数对话框-->
    <el-dialog :title='"添加" + titleText' :visible.sync='addDialogVisible' width='50%' @close='addDialogClosed'>
      <el-form :model='addForm' :rules='addFormRules' ref='addFormRef' label-width='100px'>
        <el-form-item :label='titleText' prop='attr_name'>
          <el-input v-model='addForm.attr_name'></el-input>
        </el-form-item>
      </el-form>
      <span slot='footer' class='dialog-footer'>
    <el-button @click='addDialogVisible = false'>取 消</el-button>
    <el-button type='primary' @click='addParams'>确 定</el-button>
  </span>
    </el-dialog>

    <!--修改参数对话框-->
    <el-dialog :title='"修改" + titleText' :visible.sync='editDialogVisible' width='50%' @close='editDialogClosed'>
      <el-form :model='editForm' :rules='editFormRules' ref='editFormRef' label-width='100px'>
        <el-form-item :label='titleText' prop='attr_name'>
          <el-input v-model='editForm.attr_name'></el-input>
        </el-form-item>
      </el-form>
      <span slot='footer' class='dialog-footer'>
    <el-button @click='editDialogVisible = false'>取 消</el-button>
    <el-button type='primary' @click='editParams'>确 定</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Params',
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 级联选择框双向绑定
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单验证对象
      addFormRules: {
        attr_name: {
          required: true,
          message: '请输入参数名称',
          trigger: 'blur'
        }
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改参数的表单数据对象
      editForm: {},
      // 修改表单验证对象
      editFormRules: {
        attr_name: {
          required: true,
          message: '请输入参数名称',
          trigger: 'blur'
        }
      }
    }
  },
  created() {
    // 获取所有商品分类列表
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data
      console.log(this.catelist)
    },
    // 级联选择器改变监听处理函数
    handleChange() {
      this.getParamsData()
    },
    // tab页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数列表
    async getParamsData() {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 根据所有分类的id，和当前所在面板，获取对应数据
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听对话框关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        } else {
          this.$message.success('添加参数成功')
          this.addDialogVisible = false
          await this.getParamsData()
        }
      })
    },
    // 点击按钮，展示修改对话框
    async showEditDialog(attrid) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrid}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 修改参数
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        } else {
          this.$message.success('修改参数成功！')
          await this.getParamsData()
          this.editDialogVisible = false
        }
      })
    },
    // 删除参数
    async removeParams(attrid) {
      // 弹框询问是否删除
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      } else {
        const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrid}`)
        if (res.meta.status !== 200) {
          return this.$message.error('删除参数失败！')
        } else {
          this.$message.success('删除参数成功！')
          await this.getParamsData()
        }
      }
    },
    // 文本框失去焦点，或按下enter都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return null
      }
      // 输入内容，需要后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 提交数据到后端
      await this.saveAttrVals(row)
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获取焦点, $nextTick就是当页面上元素被重新渲染后，才会指定回调函数代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    },
    // 将attr_vals添加到数据库
    async saveAttrVals(row) {
      // 提交数据到后端
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }
      this.$message.success('修改参数项成功！')
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级ID
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      } else {
        return null
      }
    },
    // 动态计算标题
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }

}
</script>

<style lang='less' scoped>
.opt {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px
}
</style>
